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5z+3 - 2z-7
= 5z - 2z +3 - 7
= 3z - 4
semoga membantu
(5z + 3) - (2z-7)
= 5z + 3 - 2z + 7
kemudian kumpulkan yang sejenis
= 5z - 2z +3 + 7
= 3z + 10
Jawabannya adalah 3z + 10
Semoga Bermanfaat...